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workflow](https://github.com/mgree/ffs/actions/workflows/build.yml/badge.svg)](https://github.com/mgree/ffs/actions/workflows/build.yml)\n[![Crates.io](https://img.shields.io/crates/v/ffs.svg)](https://crates.io/crates/ffs)\n\nffs, the **f**ile **f**ile**s**ystem, let's you mount semi-structured\ndata as a filesystem---a tree structure you already know how to work with!\n\nWorking with semi-structured data using command-line tools is hard.\nTools like [jq](https://github.com/stedolan/jq) help a lot, but\nlearning a new language for simple manipulations is a big ask. By mapping\nhard-to-parse trees into a filesystem, you can keep using the tools you\nknow.\n\n# Example\n\nRun `ffs [file.blah]` to mount `file.blah` at the mountpoint `file`. The\nfinal, updated version of the file will be outputted on stdout.\n\n```shell-session\n$ cat object.json\n{ \"name\": \"Michael Greenberg\", \"eyes\": 2, \"fingernails\": 10, \"human\": true }\n$ ffs -o object_edited.json object.json \u0026\n[1] 60182\n$ tree object\nobject\n├── eyes\n├── fingernails\n├── human\n└── name\n\n0 directories, 4 files\n$ echo Mikey Indiana \u003eobject/name\n$ echo 1 \u003eobject/nose\n$ mkdir object/pockets\n$ cd object/pockets/\n$ echo keys \u003epants\n$ echo pen \u003eshirt\n$ cd ..\n$ cd ..\n$ umount object\n$\n[1]+  Done                    ffs -o object_edited.json object.json\n$ cat object_edited.json\n{\"eyes\":2,\"fingernails\":10,\"human\":true,\"name\":\"Mikey Indiana\",\"nose\":1,\"pockets\":{\"pants\":\"keys\",\"shirt\":\"pen\"}}\n```\n\nYou can specify an explicit mountpoint by running `ffs -m MOUNT file`;\nyou can specify an output file with `-o OUTPUT`. You can edit a file\nin place by running `ffs -i file`---when the volume is unmounted, the\nresulting output will be written back to `file`.\n\nYou can control whether directories are rendered as objects or arrays\nlists using extended file attributes (xattrs): the `user.type` xattr\nspecifies `named` for objects and `list` for arrays. Here, we create a\nnew JSON file and use Linux's `setfattr` to mark a directory as being\na list:\n\n```ShellSession\n~$ ffs --new l.json \u0026\n[1] 287077\n~$ cd l\n~/l $ echo 'hi' \u003ea\n~/l $ echo 'bye' \u003eb\n~/l $ echo 'hello' \u003ea1\n~/l $ ls\na  a1  b\n~/l $ cd ..\n~$ setfattr -n user.type -v list l\n~$ umount l\n[1]+  Done                    ffs --new l.json\n~$ cat l.json\n[\"hi\",\"hello\",\"bye\"]\n```\n\n# External dependencies\n\nYou need an appropriate [FUSE](https://github.com/libfuse/libfuse) along with\n[pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/).\n\nSee [the GitHub build\nworkflow](https://github.com/mgree/ffs/blob/main/.github/workflows/build.yml)\nfor examples of external dependency installation.\n\n# pack/unpack\n\n`ffs` only works on Linux, using FUSE to make a synthetic filesystem.\n\nThe `pack`/`unpack` tools in this repository work differently: they turn\nfilesystems into semi-structured data (`pack`) and semi-structured data into\nfiles (`unpack`). 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